WO2001081034A1 - Cutting tool system and means of accurately positioning the same - Google Patents
Cutting tool system and means of accurately positioning the same Download PDFInfo
- Publication number
- WO2001081034A1 WO2001081034A1 PCT/SE2001/000717 SE0100717W WO0181034A1 WO 2001081034 A1 WO2001081034 A1 WO 2001081034A1 SE 0100717 W SE0100717 W SE 0100717W WO 0181034 A1 WO0181034 A1 WO 0181034A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting tool
- tool
- aperture
- shaft portion
- recess
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/04—Tool holders for a single cutting tool
- B23B29/06—Tool holders equipped with longitudinally-arranged grooves for setting the cutting tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/04—Tool holders for a single cutting tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2260/00—Details of constructional elements
- B23B2260/004—Adjustable elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2260/00—Details of constructional elements
- B23B2260/088—Indication scales
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/13—Angularly adjustable or indexing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/25—Lathe
- Y10T82/2531—Carriage feed
- Y10T82/2541—Slide rest
- Y10T82/2543—Multiple tool support
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/25—Lathe
- Y10T82/2585—Tool rest
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/25—Lathe
- Y10T82/2585—Tool rest
- Y10T82/2589—Quick release tool or holder clamp
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/25—Lathe
- Y10T82/2585—Tool rest
- Y10T82/2591—Tool post
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/30—Miscellaneous
Definitions
- This invention relates to a system for rapidly and accurately establishing the correct position of the operative cutting edge on tools for chip forming metal machining and in particular those used for internal turning such as boring bars which are clamped in tool clamping devices.
- Said cutting tools comprising a shaft and at least one cutting edge at least at one end of the shaft.
- the said, at least one cutting edge being either on a cutting insert which can be attached to the cutting tool mechanically, for example by use of a screw or metallurgically, for example by use of welding or the cutting edge can be an integral part of a solid, one piece tool.
- the first embodiment of the invention involves a cutting tool having an operative cutting edge that is positioned offset from the longitudinal axis of the cutting tool and at a greater distance from said axis than any other part of the tool.
- the cutting tool is held in place in the machine tool by a tool- clamping device in which it can be rotated around its longitudinal axis prior to being clamped in position.
- a relatively minor angular adjustment of the cutting tool has a significant effect on the position of the operative cutting edge of the insert in relation to a horizontal plane running through the longitudinal axis of the cutting tool.
- the present invention ensures the exact and rapid positioning of the edge.
- Other embodiments of the same invention ensure the exact distance of the cutting edge from the tool-clamping device that is to say the overhang or combinations of the angular adjustment and the overhang.
- SE 500 836 teaches the use of a spirit level in contact with a flat planar upper surface of a boring bar which is used to ensure that the operative cutting edge of the insert mounted on the cutting tool is clamped in a pre-determined position.
- This solution has the disadvantage (already mentioned) that the planar surface decreases the material in the bar and hence its strength.
- the use of a spirit level is not desirable in the limited space and poor accessibility in a modern machine tool plus the difficulties of reading a spirit level because of the cooling fluid and chips.
- WO 95/35179 teaches the use of a partially cylindrical boring bar with two planar longitudinal surfaces running parallel to the longitudinal axis of the bar. Said surfaces abutting against matching surfaces in a "V" shaped groove in the tool block. This solution also involves a weakening of the bar as described in the previous example.
- SE 509 421 also teaches the use of a setting device to determine the angular position of a cutting tool and cutting edge. The cutting tool is locked in position in the device using a fixing element, which interacts with a cylindrical aperture in the envelope surface of the cutting tool. A rotatable disc with angular markings is then used together with a spirit level to determine the angular position of the cutting edge. This solution is time consuming to use and is not suitable for the limited space and poor accessibility in a machine tool.
- the aims of the present invention are to eliminate the disadvantages of previously known methods for determining the exact position of the operative cutting edge.
- the first objective is to create a system which can be used on a bar which is substantially cylindrical in other words the requirement of one or several planar reference surfaces or a deep "V" groove which weakens the bar is avoided.
- FIGURE 1 is a perspective view of prior art combination of cutting tool and tool clamping device.
- FIGURE 2 is a perspective view of prior art showing another combination of cutting tool and tool clamping device.
- FIGURE 3 is a perspective view of prior art showing another combination of cutting tool and tool clamping device.
- FIGURE 4 is a perspective view of a cutting tool and tool clamping device according to the invention.
- FIGURE 4a is a perspective view of an alternative application of the invention.
- FIGURE 4b is a perspective view of an alternative application of the invention.
- FIGURE 4c is a perspective view of an alternative application of the invention.
- FIGURE 5 is a perspective view of an alternative application of the invention.
- FIGURE 5a is a perspective view of an alternative application of the invention.
- FIGURE 5b is a perspective view of an alternative application of the invention.
- FIGURE 6 is a cross-sectional view of the cutting tool, tool-clamping device and spring loaded device.
- FIGURE 7 is a detailed cross-sectional view of the first embodiment of the spring- loaded device
- FIGURE 8 is a detailed cross-sectional view of a second embodiment of the spring- loaded device.
- FIGURE 9 is a cross-sectional view of the locating device.
- FIGURE 10 is a detailed cross-sectional view of the cutting tool in the tool-clamping device showing the means of measuring the cutting edge height.
- Fig. 1 illustrates a typical prior art combination consisting of a cutting tool 1 for example a boring bar and a tool-clamping device 15.
- the cutting tool consists of a substantially cylindrical shaft portion 3 with front 9 and rear ends 1 1.
- the front end accommodates at least one cutting insert 5.
- the cutting tool 1 is located and secured in the tool clamping device 15 by means of at least one clamping screw 17 acting on a planar surface 13 on the upper side of the bar.
- the lower part of an aperture 23 in the tool block being V-shaped 21.
- Fig. 2 illustrates another prior art clamping method in which a substantially cylindrical cutting tool 1 is accommodated in a correspondingly substantially cylindrical aperture 23 in a tool block 15.
- Said block featuring a longitudinal split 19 along the entire length of one side.
- One or more screws 65 are arranged perpendicular to the split and pass from the upper surface of the block though non-threaded apertures and through the split and into threaded apertures on the block below the split. When the screws are tightened the split is caused to narrow and as a consequence the effective diameter of the aperture 23 is reduced. In this manner a clamping force is exerted by the inner surface of the aperture 23 onto a large contact surface of the substantially cylindrical shaft 3.
- This solution provides an excellent clamping force but no means of obtaining positional accuracy.
- To be able to accurately locate the height of the cutting edge 7 on the cutting insert 5 a reference surface and dial gauge are required.
- a prior art solution is shown which is similar to that in Fig. 2 in that a cylindrical cutting tool 1 is located in the tool block but here a scribe line 25 has been provided the upper side of the bar running longitudinally and parallel to the axis of the boring shaft 3.
- a scribe line 27 is also provided on the front face of the tool block.
- Fig. 4 illustrates a cutting tool and tool block according to the invention.
- the cutting tool 1 comprises a substantially cylindrical shaft portion 3 and a front portion 9. Said front portion comprises at least one cutting edge 7.
- the upper envelope surface of the shaft is equipped with a recess 21 in the form of a "U" shaped groove, which runs parallel with the longitudinal centre axis of the bar.
- the groove has a symmetrical cross sectional form and the two side surfaces of the groove, as seen in cross section, are of equal length.
- the outer diameter of the cylindrical part of the cutting tool is denoted "d".
- the tool block 15 features an aperture 23, which runs the entire length of the block with openings both at the front 53, and rear 55 surfaces.
- the inner diameter of the bore “D” is somewhat larger than the outer diameter "d” of the cutting tool.
- a longitudinal split 19 links the bore to one of the side surfaces 57 of the tool block along the entire length of the tool block.
- One or more apertures are provided from the upper surface of the tool block running vertically downwards through the split 19 and into the lower part of the block. The lower part of said aperture being threaded to enable a screw 65 to be passed through the aperture in the upper part of the block 59 and be screwed into the lower part 61. The action of this or these screws being to force the parts of the block immediately above and below the groove together thus reducing the effective diameter "D" and clamping the cutting tool accommodated in said bore.
- the tool- clamping device 15 features a bore 45 running vertically downwards from the upper surface of the block and opening up in the centre aperture which accommodates the bar. Said bore is located close to the front edge of the block where the upper surface 63 meets the front face 53 and its centre line cuts the centre line CL2 of the aperture in the tool block.
- This bore accommodates a spring-loaded device 30, which is illustrated in more detail in Fig. 6.
- the recess, in this case a groove interacts with the spring loaded device to give a slight but significant increase of the force required to rotate the cutting tool around its centre longitudinal axis as it passes the point of interaction. Once the correct location has been thus established the cutting tool is clamped in the clamping device.
- Fig. 4a illustrates a second embodiment of the invention in which the recess or recesses 21 are in the form of symmetrical, inverted, conical dimples in the envelope surface of the tool carrier with a basically "U " shaped cross section irrespective of whether the cross section of the cutting tool is taken along the length of the cutting tool or at 90 degrees to it. If a plurality of such dimples is used they are to be arranged in a line parallel to the centre line of the cutting tool and to be spaced at regular intervals for example 10 mm from each other.
- the positioning of the spring-loaded device is the same as in the embodiment described in Fig. 4. and the interplay between the spring- loaded device and dimple is similar. Thus the device provides an indication in this case of both the rotational position of the cutting tool and the longitudinal position.
- Fig. 4b illustrates a further embodiment of the cutting tool where, in this case, recesses in the form of "U" shaped grooves 21 positioned in the envelope surface of the shaft portion 3 and run all the way or part of the way round the shaft in a plane which is at right angles to the longitudinal centre axis of the cutting tool.
- the grooves to be spaced at regular intervals from each other, for example at 10 mm spacing.
- the interaction with the spring loaded device 30 is similar in this case to those described earlier with the exception that the solution described here can only be used for the longitudinal location of the cutting tool in the clamping device.
- Fig. 4c illustrates a further embodiment of the invention that is very similar in design and function to that shown and described with Fig. 4b.
- the difference in this case being that the shaft portion of the cutting tool and the matching aperture in the clamping device are prismatic rather than cylindrical.
- Recesses in the form of grooves 21 are provided on one or more of the planar faces of the cutting tool in a plane at right angles to the longitudinal centre line of the cutting tool. The interaction with the spring-loaded device can only be used for the longitudinal location of the cutting tool in the clamping device.
- Figs. 5, 5a and 5b illustrate the invention as used in an arrangement that is especially suited for modern machine tools.
- a sleeve 47 has been introduced between the bar and the tool block or tool adaptor 49.
- the sleeve is designed to accommodate a spring-loaded device 30, as also is the adaptor in exactly the same manner as described above for figure 4.
- the spring-loaded device is used only to give an indication of a required position prior to clamping the cutting tool.
- clamping is carried out with the help of the screws 65, which lock the sleeve in position through interaction with the planar surface of a whistle notch and at the same time exert a pressure on the sleeve causing the slit 19 to narrow hence clamping the cutting tool in the sleeve.
- Fig. 6 and 7 illustrate a cross section through the cutting tool 1 , clamping device 15 and the spring loaded device 30.
- the spring-loaded device is installed in bore 45 close to the upper front edge of the tool-clamping device. The position of the device in the bore is carefully adjusted to ensure the correct interplay between the spring-loaded device 45 and the dimple or groove 21 in the tool holder.
- the spring loaded device 30 consists of a housing 25 with an external thread and a groove 43 in the one end surface 37 said groove being designed to accommodate the tip of a screw driver which is to be used when screwing the spring loaded device into place in the tool block.
- the cylindrical housing has an aperture at its lower end into which a coil spring 31 and sphere or cylinder 33 are mounted.
- the sphere When the aperture in the housing and the "U" groove or dimple 21 in the outer envelope of the cutting tool are inline the sphere will be pushed by the force of the spring partially into said groove.
- the size of the sphere and the depth and angle of the sidewalls of the groove are carefully chosen to ensure that the sphere does not become fixed in the groove.
- the combination is designed simply to give a mechanical and on occasions also a slight audible indication that the spring loaded device and groove are in line and hence the height and/or the longitudinal position of the operative cutting edge is correct.
- the mechanical indication is in the form of a slight but distinct increase in the manual force required to rotate the bar slightly round or parallel to the longitudinal axis when departing from the position where groove/dimple and spring loaded device are in line.
- the audible spring loaded device is a "click" sound heard when the sphere locates in the groove. Naturally it may not always be possible to hear the audible signal because of the high noise level in the machine tool.
- Fig. 8 is a detailed cross-sectional view of a second embodiment of the spring loaded device in interaction with the "U" groove on the circumference of the cutting tool in this particular case the construction of the spring loaded device has been simplified so that it consists of just a sphere or cylinder 33 and an elastic, for example rubber, cylindrical cap 51 which serves both to retain the sphere or cylinder in place and allow the sphere or cylinder to move slightly upwards when a pressure is applied from below.
- the diameter of the aperture is reduced at the open end to ensure that the sphere 33 is retained in the aperture whilst still allowing the sphere to protrude sufficiently so that it can interact with the "U" -groove or dimple on the envelope surface of the cutting tool.
- Fig. 9 is a cross section of the sphere or cylinder 33 of the spring loaded device and the cutting tool 1 showing the interplay between the sphere and the recess 21 substantially to scale.
- the diameter of the sphere or cylinder is typically in the range 2-5 mm and the recommended value 2,5 mm.
- the depth of the "U" shaped recess is typically in the range 0,01-0,2 mm and the recommended value is 0,04-0,06 mm.
- the point angle of the "U" shaped recess lies between 35-85°, preferably 55-65° and recommendably about 60°.
- Fig. 10 illustrates how practical tests were carried out to assess the repeatable positional accuracy obtained using the spring loaded device according to the invention and the scribe line method.
- This figure shows the method as used with the system according to the invention.
- the cutting tool 1 is mounted in the tool clamping device 15 and the cutting tool position is brought into the desired position by rotating the cutting tool to the position where a slight increase of force is required to rotate it further in either direction.
- the clock gauge 67 is then used to measure the height of the cutting edge 7 on the insert 5.
- scribe lines on the envelope surface of the cutting tool and on the front face of the tool claming device were brought in line to obtain the desired position of the cutting edge.
- the scribe line method gave an average deviation in cutting edge height of 0,086 mm whereas the method according to the invention gave an average of 0,011 mm. These values correspond to angular deviations of 1° 5 ' and 0° 8 ' respectively. In other words the use of the spring loaded device gives more than eight times greater precision than the scribe line method.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Turning (AREA)
- Drilling Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60129944T DE60129944T2 (en) | 2000-04-20 | 2001-04-02 | CUTTING TOOL AND DEVICE FOR ACCURATE POSITIONING THEREOF |
EP01918120A EP1274531B1 (en) | 2000-04-20 | 2001-04-02 | Cutting tool system and means of accurately positioning the same |
JP2001578118A JP4387632B2 (en) | 2000-04-20 | 2001-04-02 | Cutting tool system and its precise positioning means |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0001473A SE518027C2 (en) | 2000-04-20 | 2000-04-20 | Cutting tool system and means for precisely positioning the same |
SE0001473-8 | 2000-04-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001081034A1 true WO2001081034A1 (en) | 2001-11-01 |
Family
ID=20279395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2001/000717 WO2001081034A1 (en) | 2000-04-20 | 2001-04-02 | Cutting tool system and means of accurately positioning the same |
Country Status (9)
Country | Link |
---|---|
US (1) | US6854367B2 (en) |
EP (1) | EP1274531B1 (en) |
JP (1) | JP4387632B2 (en) |
KR (1) | KR100682610B1 (en) |
CN (1) | CN1187154C (en) |
AT (1) | ATE369931T1 (en) |
DE (1) | DE60129944T2 (en) |
SE (1) | SE518027C2 (en) |
WO (1) | WO2001081034A1 (en) |
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ITMO20090305A1 (en) * | 2009-12-22 | 2011-06-23 | Tiziano Setti | TOOL FOR CENTERING PROCESSING WITH CHOPPER REMOVAL |
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- 2001-04-02 KR KR1020027013972A patent/KR100682610B1/en active IP Right Grant
- 2001-04-02 DE DE60129944T patent/DE60129944T2/en not_active Expired - Lifetime
- 2001-04-02 CN CNB018083846A patent/CN1187154C/en not_active Expired - Lifetime
- 2001-04-02 AT AT01918120T patent/ATE369931T1/en not_active IP Right Cessation
- 2001-04-02 EP EP01918120A patent/EP1274531B1/en not_active Expired - Lifetime
- 2001-04-02 JP JP2001578118A patent/JP4387632B2/en not_active Expired - Lifetime
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100976027B1 (en) * | 2003-06-24 | 2010-08-17 | 두산인프라코어 주식회사 | A Tool Holding Device For A Long-Boring Processing in CNC |
WO2009145693A3 (en) * | 2009-05-26 | 2010-04-01 | Volvo Aero Corporation | A holder for a cutting tool, a cutting tool and a cutting insert |
US8992139B2 (en) | 2009-05-26 | 2015-03-31 | Gkn Aerospace Sweden Ab | Holder for a cutting tool, a cutting tool and a cutting insert |
ITMO20090305A1 (en) * | 2009-12-22 | 2011-06-23 | Tiziano Setti | TOOL FOR CENTERING PROCESSING WITH CHOPPER REMOVAL |
CN102814681A (en) * | 2012-08-30 | 2012-12-12 | 无锡易通精密机械股份有限公司 | Collet tool for boring tool |
Also Published As
Publication number | Publication date |
---|---|
DE60129944D1 (en) | 2007-09-27 |
CN1187154C (en) | 2005-02-02 |
KR20020091219A (en) | 2002-12-05 |
JP4387632B2 (en) | 2009-12-16 |
EP1274531A1 (en) | 2003-01-15 |
SE518027C2 (en) | 2002-08-20 |
SE0001473D0 (en) | 2000-04-20 |
KR100682610B1 (en) | 2007-02-15 |
CN1426336A (en) | 2003-06-25 |
US6854367B2 (en) | 2005-02-15 |
SE0001473L (en) | 2001-10-21 |
JP2003531022A (en) | 2003-10-21 |
EP1274531B1 (en) | 2007-08-15 |
ATE369931T1 (en) | 2007-09-15 |
US20020035902A1 (en) | 2002-03-28 |
DE60129944T2 (en) | 2008-05-15 |
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